8 small Jersey Royal potatoes or new potatoes, scrubbed
400g/14oz cavolo nero, stalks removed
1 garlic bulb, skin-on and smashed
3 garlic cloves
6 sage leaves
1–2 tsp Dijon mustard
100–200ml/3½–7fl oz chicken stock
salt and freshly ground black pepper
pinch ground nutmeg
1 tbsp olive oil
2 tbsp olive oil
50–100ml/2–3½fl oz olive oil
50²µ/1¾´Ç³ú pine nuts
30g/1oz salted butter
100²µ/3½´Ç³ú Parmesan, grated
1 sirloin steak on the bone (about 500g/1lb 2oz)